Wikipedia

Saddleback toad

The saddleback toads are the familyBrachycephalidae/ˈbrækɨsɛˈfælɨdiː/ in the orderAnura. As traditionally defined, the family is often limited to just one genus, Brachycephalus, but it is closely related to Ischnocnema, which therefore is placed in the family in recent treatments.[1][2]Brachycephalus species are tiny, often yellow frogs that are native to Atlantic Forest in southeastern Brazil. In at least one species, B. ephippium, the bright colours are aposematic, warning potential predators of its toxicity, specifically tetrodotoxin.[3]

Brachycephalus species are very small frogs, up to 1.8 cm (0.71 in) in length (mostly around 1 cm or 0.39 in), and include the smallest frog in the Southern Hemisphere, Izecksohn's toad (Brachycephalus didactylus).[4] They have only three toes on each foot, and two fingers on each hand. This is in contrast to the usual five toes and four fingers of most frogs.

Brachycephalus species are active during the day, and live in the leaf litter on forest floors. The eggs undergo direct development, hatching into miniature frogs, without a tadpole stage.[4] The eggs are laid on the ground, and covered in soil to protect them from the heat and predators. Their amplexus method is unusual, in that it begins with inguinal amplexus, with the male holding the female around the waist, and then shifts to axillary amplexus, in which the male grips above the female's arms. Most frogs species only use one technique.